What is the cheapest and most widely used metal?

Iron is indeed the cheapest and most widely used metal due to its abundance and versatility. It is primarily extracted from iron ore, which is readily available in many parts of the world. Iron's properties, such as its strength, malleability, and ability to be alloyed with other elements, make it suitable for a wide range of applications, including construction, manufacturing, and transportation.

Additionally, the production process for iron is relatively low in cost compared to other metals, which contributes to its widespread use. The steel industry, which is primarily based on iron, further amplifies its significance in everyday products, infrastructure, and machinery.

While aluminum, copper, and steel also have important uses, they tend to be more expensive or have a more specific range of applications that do not match the overall demand and utility of iron. This widespread preference for iron underscores its status as a fundamental material in various industries.